In the 1940s, The Adventures of Superman was a radio sensation. Kids across the country huddled around their sets as the Man of Steel leapt off the page and over the airwaves. Although Superman had been fighting crime in print since 1938, the weekly audio episodes fleshed out his storyline even further. It was on the radio that Superman first faced kryptonite, met Daily Planet reporter Jimmy Olsen, and became associated with “truth, justice, and the American way.” So, it’s no wonder that when a young writer and activist named Stetson Kennedy decided to expose the secrets of the Ku Klux Klan, he looked to a certain superhero for inspiration.

In the post-World War II era, the Klan experienced a huge resurgence. Its membership was skyrocketing, and its political influence was increasing, so Kennedy went undercover to infiltrate the group. By regularly attending meetings, he became privy to the organization’s secrets. But when he took the information to local authorities, they had little interest in using it. The Klan had become so powerful and intimidating that police were hesitant to build a case against them.

Struggling to make use of his findings, Kennedy approached the writers of the Superman radio serial. It was perfect timing. With the war over and the Nazis no longer a threat, the producers were looking for a new villain for Superman to fight. The KKK was a great fit for the role.

In a 16-episode series titled “Clan of the Fiery Cross,” the writers pitted the Man of Steel against the men in white hoods.

As the storyline progressed, the shows exposed many of the KKK’s most guarded secrets. By revealing everything from code words to rituals, the program completely stripped the Klan of its mystique. Within two weeks of the broadcast, KKK recruitment was down to zero. And by 1948, people were showing up to Klan rallies just to mock them.